EP3757893B1 - Antenna pattern, rfid inlay, rfid label, and rfid medium - Google Patents
Antenna pattern, rfid inlay, rfid label, and rfid medium Download PDFInfo
- Publication number
- EP3757893B1 EP3757893B1 EP19757232.4A EP19757232A EP3757893B1 EP 3757893 B1 EP3757893 B1 EP 3757893B1 EP 19757232 A EP19757232 A EP 19757232A EP 3757893 B1 EP3757893 B1 EP 3757893B1
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- European Patent Office
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- long
- substrate
- sub
- rfid
- pair
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Images
Classifications
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- H—ELECTRICITY
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- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/06—Details
- H01Q9/065—Microstrip dipole antennas
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- G—PHYSICS
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- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
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- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
- G06K19/07794—Antenna details the record carrier comprising a booster or auxiliary antenna in addition to the antenna connected directly to the integrated circuit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/305—Associated digital information
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- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
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- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
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- G—PHYSICS
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- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
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- G06K19/07758—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag
- G06K19/0776—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag the adhering arrangement being a layer of adhesive, so that the record carrier can function as a sticker
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- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
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- G06K19/07766—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card comprising at least a second communication arrangement in addition to a first non-contact communication arrangement
- G06K19/07767—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card comprising at least a second communication arrangement in addition to a first non-contact communication arrangement the first and second communication means being two different antennas types, e.g. dipole and coil type, or two antennas of the same kind but operating at different frequencies
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
- G06K19/07786—Antenna details the antenna being of the HF type, such as a dipole
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- H—ELECTRICITY
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- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/20—Two collinear substantially straight active elements; Substantially straight single active elements
- H01Q9/24—Shunt feed arrangements to single active elements, e.g. for delta matching
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- H—ELECTRICITY
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- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
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- H—ELECTRICITY
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- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
- H01Q9/285—Planar dipole
Definitions
- the present invention relates to an antenna pattern applied to a UHF frequency band RFID, an RFID inlay, an RFID label, and an RFID medium.
- tags that are attached to the products and labels that are adhered to the products, etc. are used. Information related to the products are printed on the tags and the labels so as to be visible.
- RFID Radio Frequency Identification
- an RFID medium On the tag, the label, an wrist band, and so forth (hereinafter, referred to as an RFID medium) are incorporated an antenna pattern and the IC chip with an RFID specification as described above, information related to a target for attachment, a target for affixation, or an wearer (hereinafter, collectively referred to as an adherend) is printed so as to be visible, and it is possible to store various information related to the adherend in the incorporated IC chip.
- an adherend information related to a target for attachment, a target for affixation, or an wearer
- Document US 2018/039878 A1 describes an RFID tag including an inlay (made of an IC chip and an antenna) and an auxiliary antenna laminated on the inlay in an insulated state.
- the auxiliary antenna is electrically coupled with the IC chip via capacitive coupling and functions as an antenna to improve/adjust the communication characteristics, in particular the range, of the inlay.
- a UHF frequency band RFID inlay having an IC chip, a loop portion connected with the IC chip, and a dipole antenna connected with the loop portion has been disclosed (see JP2010-237853A ).
- the RFID inlay described in JP2010-237853A has a directivity in which a good gain is obtained in the crossing direction with respect to the direction in which the dipole antenna extends, but the gain is poor in the direction in which the dipole antenna extends, and there is a problem in that, when a reader/writer is located in the latter direction, a transmission and reception of data becomes unstable.
- the RFID inlay is applied to, for example, an application in which entrance and exit of a holder of "ID-1" standard card specified in ISO/IEC 7810 is managed by mounting the RFID inlay on the card and an application in which a timing of finishing of a competitor is recorded by affixing the RFID inlay to a numbered bib, etc. of the competitor, there has been a problem in that transmission and reception of information cannot be performed correctly depending on an orientation of the RFID inlay or a positional relationship between the RFID inlay and an RFID reader.
- an object of the present invention is to increase a direction and range capable of performing transmission and reception by improving directivity of an antenna in a UHF frequency band RFID inlay.
- an antenna pattern for being used in a UHF frequency band RFID inlay, the antenna pattern comprising: a substrate; a dipole antenna formed on a front surface of the substrate with a metal foil; and a sub-element formed on a back surface of the substrate with the metal foil, wherein the dipole antenna is provided with: a loop portion having an IC chip connecting portion to which an IC chip is connected; a pair of meanders configured to respectively extend from the loop portion so as to be line symmetrical by being connected to the loop portion at end portions on one side; and capacitance hats respectively connected to the pair of meanders, and the sub-element has a pair of U-shapes, the sub-element being arranged such that opening sides of the U-shapes face with each other so as to be line symmetrical, the sub-element being formed such that a part thereof overlaps with the dipole antenna through the substrate.
- the RFID inlay 1 and an antenna pattern 10 according to a first embodiment of the present invention will be described.
- the RFID inlay 1 in this embodiment is a UHF frequency band RFID inlay.
- FIG. 1A is an external view for explaining a front surface of the RFID inlay 1 according to the first embodiment
- FIG. 1B is a sectional view taken along a line B-B in FIG. 1A
- FIG. 2 is an external view for explaining a back surface of the RFID inlay 1 according to the first embodiment.
- an IC chip 20 with an RFID (Radio Frequency Identification) specification is bonded to the antenna pattern 10 by a vulcanization bonding, etc. using an anisotropic conductive paste or a conductive film.
- the antenna pattern 10 is provided with a dipole antenna 31 that is formed on a front surface 11A of a substrate 11 with a metal foil and a sub-element 32 that is formed on a back surface 11B of the substrate 11 with the metal foil. As shown in FIG. 1B , the dipole antenna 31 and the sub-element 32 are laminated on the substrate 11 with an adhesive agent A.
- the sub-element 32 that is formed on the back surface 11B is illustrated with a dotted line.
- the dipole antenna 31 that is formed on the front surface 11A is illustrated with a dotted line.
- the direction in which the dipole antenna 31 extends is described as the X direction of the RFID inlay 1, and the direction perpendicular to the X direction is described as the Y direction of the RFID inlay 1.
- the dipole antenna 31 has a loop portion 12 that is formed on the front surface 11A of the substrate 11 with the metal foil and that has an IC chip connecting portion 101 to which the IC chip 20 is connected.
- the loop portion 12 is formed on the front surface 11A of the substrate 11 with the metal foil and has the IC chip connecting portion 101 to which the IC chip 20 is connected and a power feeding portion 102 to which meander end portions 111 and 112 of the dipole antenna 31 are connected.
- the loop portion 12 is formed to have a loop shape that is line symmetrical with respect to a line that passes through the IC chip connecting portion 101 and that is parallel to the Y direction.
- the loop portion 12 is formed to have a rectangular shape and has a pair of long-side portions 121 and 122 facing with each other.
- the loop portion 12 has a pair of short-side portions 124 and 125 that respectively connect end portions of the long-side portions 121 and 122 with each other.
- the IC chip connecting portion 101 is formed at the center portion of the long-side portion 121 on one side, and the power feeding portion 102 is formed towards the center portion side of the long-side portion 122 facing the long-side portion 121 on which the IC chip connecting portion 101 is formed.
- the dipole antenna 31 is formed in left-right symmetry with respect to the IC chip 20.
- the dipole antenna 31 has, on the front surface 11A, meanders 126 and 127 that are formed so as to extend in the opposite directions with each other with respect to the loop portion 12, and capacitance hats 128 and 129 that are connected to the meanders 126 and 127, respectively.
- connecting ends of the meanders 126 and 127 to the loop portion 12 correspond to the meander end portions 111 and 112, respectively.
- Number of folded portions, curvature radius of curved portions, lengths of the respective portions in the meanders 126 and 127 are set in consideration of an antenna efficiency.
- FIG. 2 the components formed on the front surface 11A are illustrated with dotted lines.
- the sub-element 32 formed on the back surface 11B has an element 310 on one side and an element 320 on the other side, and the element 310 and the element 320 each has U-shape and are formed such that their opening sides face each other so as to be in line symmetrical with respect to a line that passes through the IC chip 20 and that is parallel to the Y direction of the RFID inlay 1.
- the element 310 has parallel portions 313 and 314 that are formed in parallel with the X direction in which the dipole antenna 31 extends and a perpendicular portion 315 that joins end portions of the parallel portions 313 and 314.
- the element 320 has parallel portions 323 and 324 that are formed in parallel with the X direction in which the dipole antenna 31 extends and a perpendicular portion 325 that joins end portions of the parallel portions 323 and 324.
- the elements 310 and 320 having the U-shape are formed so as to be symmetrical with each other such that end portions (tip end portions) 311 and 321 on one side oppose to each other and end portions (base end portions) 312 and 322 on the other side oppose to each other.
- the base end portions 312 and 322 are formed so as to overlap with parts of the loop portion 12 through the substrate 11.
- the elements 310 and 320 formed in a U-shape have a gap formed by the base end portions 312 and 322 facing each other and a gap formed by the tip end portion s 311 and 321 facing each other.
- the IC chip connecting portion 101 of the loop portion 12 is positioned so as to overlap the gap formed by the base end portions 312 and 322 through the substrate 11.
- the widths W1 and W2 of the parallel portions 313 and 314 and the width W3 of the perpendicular portion 315 in the element 310, and the widths W4 and W5 of the parallel portions 323 and 324 and the width W6 of the perpendicular portion 325 in the element 320 are all formed so as to have the same width.
- the length H in the longitudinal direction Y including the widths of the respective elements and the widths W1 to W6 of the respective parts in the elements can be set in consideration of the antenna efficiency.
- the dipole antenna 31 and the sub-element 32 described above are formed on the substrate 11.
- a part of the sub-element 32 is formed so as to overlap with a part of the dipole antenna 31 through the substrate 11 and so as to overlap with a part of the long-side portion 122 on which the power feeding portion 102 is formed.
- the parallel portion 314 in the element 310 is formed so as to overlap with a part of the dipole antenna 31 on the upper side in the Y direction on the drawings over a region from the capacitance hat 129 to the meander 127.
- the parallel portion 324 in the element 320 is formed so as to overlap with a part of the dipole antenna 31 on the upper side in the Y direction on the drawings over a region from the capacitance hat 128 to the meander 126.
- a gap d between the base end portions 312 and 322 of the sub-element 32 facing with each other is formed at the position so as to sandwich the IC chip connecting portion 101 and the power feeding portion 102 in the loop portion 12 formed on the front surface 11A through the substrate 11.
- a material applicable as the substrate 11 includes papers such as fine quality paper, coated paper, and so forth; and a single film made of a resin such as polyvinyl chloride, polyethylene terephthalate, polypropylene, polyethylene, polyethylene naphthalate, and so forth, and a multilayer film formed by laminating a plurality of the resin films.
- papers such as fine quality paper, coated paper, and so forth
- a single film made of a resin such as polyvinyl chloride, polyethylene terephthalate, polypropylene, polyethylene, polyethylene naphthalate, and so forth, and a multilayer film formed by laminating a plurality of the resin films.
- the thickness of the substrate 11 is preferably from 25 pm to 300 pm, inclusive. In a case in which the papers are used as the substrate, the thickness can be from 50 pm to 260 pm, inclusive, in the above-described range, and it is generally preferable that the thickness be 80 pm. In addition, in a case in which the resin film is used as the substrate, the thickness can be from 25 pm to 200 pm, inclusive, in the above-described range. From the above, it is possible to make an appropriate selection depending on an application purpose.
- an electrically conductive metal used for forming the antenna pattern can be applied as a metal for forming the metal foil that is used for forming the loop portion 12 and the dipole antenna 31.
- One example thereof includes copper and aluminum.
- a thickness of the metal foil in view of an overall thickness of the RFID inlay 1, of an overall thickness of the RFID medium when the RFID medium is formed, and of the manufacturing cost, it is preferable that a thickness of the metal foil be from 3 pm to 25 pm, inclusive. More preferably, the metal foil is an aluminum foil having the thickness of 20 pm.
- the metal foil is adhered to the substrate 11 with the adhesive agent A.
- the dipole antenna 31 in the antenna pattern 10 is designed as a pattern adapted to a UHF frequency band (300 MHz to 3GHz, especially, 860 MHz to 960 MHz).
- the gain is poor in the longitudinal direction of the antenna (the X direction when associated with FIG. 1 ), and transmission and reception sensitivity in this direction is lowered.
- the RFID inlay 1 is provided with the sub-element 32.
- the sub-element 32 is formed so as to overlap with a part of the dipole antenna 31 through the substrate 11 and so as to overlap with a part of the long-side portion 122 in which the power feeding portion 102 is formed.
- the sub-element 32 has a function of compensating the gain of the dipole antenna 31 such that the RFID inlay 1 functions as an omnidirectional antenna.
- the elements 310 and 320 are formed such that all of their widths W1 to W6 are the same, and thereby, it is possible to keep an impedance in a transmission line in the elements 310 and 320 constant and to increase the antenna efficiency.
- An RFID inlay 2 and an antenna pattern 40 according to a second embodiment of the present invention will be described.
- a positional relationship between the dipole antenna 31 and a sub-element 33 is modified.
- the length H of the sub-element 33 in the Y direction is longer than that of the sub-element 32.
- the gap d between base end portions 332 and 342 is reduced.
- FIG. 3 is an external view for explaining a front surface of the RFID inlay 2 according to the second embodiment.
- FIG. 4 is an external view for explaining a back surface of the RFID inlay 2 according to the second embodiment. Configurations that have the same functions as the configurations shown in the first embodiment are assigned the same reference signs, and detailed descriptions thereof shall be omitted.
- the antenna pattern 40 has the substrate 11, the loop portion 12 that is formed on the front surface 11A of the substrate 11 with the metal foil, the dipole antenna 31 that is formed on the front surface 11A of the substrate 11 with the metal foil, and the sub-element 33 that is formed on the back surface 11B.
- the sub-element 33 that is formed on the back surface 11B has a left-right symmetric U-shapes on the back surface 11B and has an element 330 on one side and an element 340 on the other side.
- the element 330 has parallel portions 333 and 334 that are formed in parallel with the X direction in which the dipole antenna 31 extends and a perpendicular portion 335 that joins end portions of the parallel portions 333 and 334.
- the element 340 has parallel portions 343 and 344 that are formed in parallel with the X direction in which the dipole antenna 31 extends and a perpendicular portion 345 that joins end portions of the parallel portions 343 and 344.
- the elements 330 and 340 are formed so as to be symmetrical with each other such that the end portions (the tip end portions) 331 and 341 on one side oppose to each other and the end portions (the base end portions) 332 and 342 on the other side oppose to each other.
- the gap formed between the base end portions 332 and 342 is formed so as to be narrower than the gap formed between the base end portions 312 and 322 in the antenna pattern 10 that is shown as the first embodiment, and the IC chip 20 is formed so as to be positioned in the gap formed between the base end portions 332 and 342 through the substrate 11.
- all of the widths of the elements 330 and 340 are formed so as to have the same width.
- a part of the sub-element 33 is formed at the position where it overlaps with a part of the dipole antenna 31 through the substrate 11, and a part of the sub-element 33 is formed at the position where it intersects with the short-side portions 124 and 125 of the loop portion 12 through the substrate 11.
- a part of the sub-element 33 is formed at the position where it does not overlap with, through the substrate 11, the long-side portion 121 formed with the IC chip connecting portion 101 and the long-side portion 122 formed with the power feeding portion 102.
- a part of the sub-element 33 overlaps with a part of the dipole antenna 31 through the substrate 11, a part of the sub-element 33 intersects with the short-side portions 124 and 125, and a part of the sub-element 33 is formed so as not to overlap with the long-side portion 121 formed with the IC chip connecting portion 101and the long-side portion 122 formed with the power feeding portion 102.
- a sub-element 34 formed in the antenna pattern 50 is formed to have a shape in which base end portions 352 and 362 of the U-shape of elements 350 and 360 are each bent outwards of the U-shape.
- each of the elements 350 and 360 has a fishhook-like shape.
- FIG. 5 is an external view for explaining a front surface of the RFID inlay 3 according to the third embodiment.
- FIG. 6 is an external view for explaining a back surface of the RFID inlay 3 according to the third embodiment. Configurations that have the same functions as the configurations shown in the first embodiment are assigned the same reference signs, and detailed descriptions thereof shall be omitted.
- the antenna pattern 50 has the substrate 11, the loop portion 12 formed on the front surface 11A of the substrate 11 with the metal foil, the dipole antenna 31 formed on the front surface 11A of the substrate 11 with the metal foil, and the sub-element 34 formed on the back surface 11B.
- the sub-element 34 formed on the back surface 11B has a symmetrical shape on the back surface 11B and has the element 350 on one side and the element 360 on the other side.
- the element 350 has parallel portions 353 and 354 that are formed in parallel with the X direction in which the dipole antenna 31 extends and a perpendicular portion 355 that joins end portions of the parallel portions 353 and 354. Furthermore, in the element 350, an end portion of the parallel portion 354 forms a bent portion 356 by being bent outwards of the substrate 11.
- the element 360 has parallel portions 363 and 364 that are formed in parallel with the X direction in which the dipole antenna 31 extends and a perpendicular portion 365 that joins end portions of the parallel portions 363 and 364. Furthermore, in the element 360, an end portion of the parallel portion 364 forms a bent portion 366 by being bent outwards of the substrate 11.
- the elements 350 and 360 are formed so as to be symmetrical with each other such that the end portions (the tip end portions) 351 and 361 on one side oppose to each other and the end portions (the base end portions) 352 and 362 on the other side are both directed towards the outer side of the substrate 11.
- all of the widths of the elements 350 and 360 are formed so as to have the same width.
- a part of the sub-element 34 is formed at the position where it overlaps with a part of the dipole antenna 31 through the substrate 11 and at the position where it overlaps with a part of the long-side portion 122 formed with the power feeding portion 102.
- the parallel portion 354 in the element 350 is formed so as to overlap with a part of the dipole antenna 31 on the upper side in the Y direction on the drawings over a region from the capacitance hat 129 to the meander 127.
- the parallel portion 364 in the element 360 is formed so as to overlap with a part of the dipole antenna 31 on the upper side in the Y direction on the drawings over a region from the capacitance hat 128 to the meander 126.
- bent portions 356 and 366 that are each a part of the sub-element 34 are formed at the positions so as to cover the entire region of the short-side portions 124 and 125, respectively, through the substrate 11.
- the parallel portion 354 in the element 350 is formed so as to overlap with a part of the dipole antenna 31 on the upper side in the Y direction on the drawings through the substrate over a region from the capacitance hat 129 to the meander 127
- the parallel portion 364 in the element 360 are formed so as to overlap with a part of the dipole antenna 31 on the upper side in the Y direction on the drawings through the substrate 11 over a region from the capacitance hat 128 to the meander 126
- the bent portions 356 and 366 that are each a part of the sub-element 34 are formed at the positions so as to cover the entire regions of the short-side portions 124 and 125, respectively, through the substrate 11.
- the gain in the X direction of the RFID inlay 3 in FIGs. 5 and 6 is increased, and thereby, it is possible to increase the transmission and reception sensitivity in the X direction.
- the RFID label 5 is formed by temporarily adhering a separator on a first surface (or a second surface) of the RFID inlay 1, which has been described as the first embodiment, with the adhesive agent and by laminating an outer substrate on the second surface.
- FIG. 7 is a diagram for explaining a back surface of the RFID label 5 according to the embodiment of the present invention.
- FIG. 8 is a diagram for explaining a front surface of the RFID label 5 according to the embodiment of the present invention.
- the RFID label 5 has: a separator 60 that is temporarily adhered on the front surface 11A of the substrate 11 of the RFID inlay 1, which has been described as the first embodiment, with an adhesive agent B; and an outer substrate 70 that is laminated, with a bonding agent C, on the back surface 11B on the reverse side of the surface on which the separator 60 has been temporarily adhered.
- the outer substrate 70 serves as an information recording substrate that is a substrate having a surface suitable for printing.
- the outer substrate 70 may be a thermal paper.
- the adhesive agent B it is possible to use an adhesive agent that can be used with the separator and a bonding agent that can be used for lamination of the substrate.
- the bonding agent C it is possible to use those that can be used to laminate the substrates.
- the bonding agent C it may be possible to use emulsion bonding agents, solvent bonding agents, and hot melt bonding agents.
- the adhesive it is possible to apply acrylic bonding agents, urethane bonding agents, silicone bonding agents, rubber bonding agents, and so forth.
- the adhesive agent instead of the bonding agent C.
- the adhesive agent that can be used in this case includes the adhesive agent such as acrylic adhesives, urethane adhesives, silicone adhesives, rubber adhesives, and so forth.
- the RFID label 5 having such a configuration, information can be printed on the outer substrate 70 having a printing surface by using a label printer, and the RFID label 5 can be used by being adhered to a product, etc. by removing the separator 60.
- the integrated RFID inlay 1 has the sub-element 32 and antenna characteristics corresponding to those of the omnidirectional antenna can be achieved, even if the RFID label 5 according to this embodiment is used by being adhered to the product, etc., it is possible to perform the transmission and reception of data without being affected by positional relationship with a reader/writer.
- the outer substrate 70 may not necessarily be required for an application purpose in which the RFID label is adhered to a part that is not exposed to the outside.
- the RFID medium 6 is formed by laminating the outer substrates on both surfaces of the RFID inlay 1, which has been described as the first embodiment, with the adhesive agent.
- FIG. 9 is a diagram for explaining a front surface of the RFID medium 6 according to the embodiment of the present invention.
- FIG. 10 is a diagram for explaining a back surface of the RFID medium 6 according to the embodiment of the present invention.
- the RFID medium 6 has an outer substrate 80 that is laminated on the front surface 11A of the substrate 11 of the RFID inlay 1, which has been described as the first embodiment, with the bonding agent C and an outer substrate 90 that is laminated on the back surface 11B with the bonding agent C.
- the outer substrates 80 and 90 may be of the same type.
- the outer substrates 80 and 90 are each the substrate for recording information and may also be the substrate having the printing surface.
- An example of the RFID medium 6 having such a configuration includes an RFID tag.
- the RFID tag can be used by attaching it to apparel product, etc. by using a thread or a tag pin.
- the integrated RFID inlay 1 has the sub-element 32 and antenna characteristics corresponding to those of the omnidirectional antenna can be achieved, even if the RFID medium 6 according to this embodiment is used by being attached to the apparel product, etc., it is possible to perform the transmission and reception of data without being affected by positional relationship with a reader/writer.
- FIG. 12 is a schematic view for explaining the directivity test.
- a UHF frequency band RFID reader/writer R/W was arranged such that its antenna center is located on a position T on a circle having radius of 1.5 meter and having its center at a position P of the IC chip in the RFID tag as a test specimen S, and wave gain from the RFID tag was measured while moving the RFID reader/writer along the circle.
- the position of the reader/writer the above-described circle is expressed in terms of angle relative to the starting position where the angle is set as 0°, and relationships between the angle and wave gain are shown on a chart.
- the RFID tag of Example 1 is manufactured on the basis of the RFID medium 6 according to this embodiment described above.
- a basic configuration is as following: the dipole antenna 31 shown in FIG. 1 was formed with an aluminum foil having the thickness of 20 pm on the front surface of a substrate made of a PET film having the thickness of 50 pm, and on the back surface thereof, the sub-element 32 shown in FIG. 2 was formed with the aluminum foil having the thickness of 20 pm, thereby forming the antenna pattern 10.
- An IC (Monza R6 from Impinj, Inc.) was mounted on thus formed dipole antenna 31 to manufacture the RFID inlay 1 according to the first embodiment.
- the configuration on the dipole antenna 31 side had the same configuration as that of Product Number: ST7015 R6-RE01 from SATO HOLDINGS CORPORATION.
- the outer substrates 80 and 90 were laminated on both surfaces of the RFID inlay 1 obtained as described above by using the bonding agent C, and thereby, the RFID tag that was used as the test specimen was obtained.
- the RFID tag used as the test specimen was obtained similarly to Example 1 except that the sub-element 33 shown in FIG. 4 was used instead of the sub-element 32.
- the RFID tag used as the test specimen was obtained similarly to Example 1 except that the sub-element 34 shown in FIG. 6 was used instead of the sub-element 32.
- FIG. 11 is an external view for explaining the RFID tag as the comparative example used for the directivity test.
- the RFID tag R as the comparative example is formed by laminating the outer substrates 80 and 90 on Product Number: ST7015 R6-RE01 from SATO HOLDINGS CORPORATION.
- FIG. 13 is a diagram showing results for the directivity test for the measurement frequency.
- the gain is weak in the direction in which the dipole antenna extends (the X direction when associated with FIG. 1 ).
- the RFID tags of Examples 1, 2, and 3 that are respectively provided with the sub-element 32, 33, and 34, the gain in the X direction is increased.
- the sub-element on the RFID inlay it is possible to increase the gain in the extending direction of the dipole antenna 31 (the X direction) that is formed so as to be connected to the loop portion 12 and to extend in the X direction.
- the dipole antenna 31 is formed on the front surface 11A and the sub-element 32 is formed on the back surface 11B.
- the front surface 11A and the back surface 11B are named for the sake of ease of explaining, and a configuration in which, in FIGs. 1 and 2 , the sub-element 32 is formed on the front surface 11A and the dipole antenna 31 is formed on the back surface 11B has equivalent advantages.
- the U-shape includes a shape in which the portion corresponding to the bottom portion of the U-shape has an arc-shape, and a shape in which the portion corresponding to the bottom portion of the U-shape is a straight line and in which both ends of the straight line continues to parallel portions of the U-shape by being curved.
- the number or turns, turning shape, and so forth of the meanders 126 and 127 in the dipole antenna 31 shown in the embodiments can be modified appropriately, and the present invention is not limited to those illustrated.
- the RFID inlay 1 For the RFID label 5 shown in FIGs. 7 and 8 , and the RFID medium 6 shown in FIGs. 9 and 10 , although a description has been given of a case in which the RFID inlay 1 according to the first embodiment employing the antenna pattern 10 is applied, the RFID inlay 2 that employs the antenna pattern 40 and the RFID inlay 3 that employs the antenna pattern 50 may also be applied.
- the present invention is also applicable to an RFID card in which the RFID inlay is mounted on "ID-1" standard card specified in ISO/IEC 7810.
- the RFID inlay is employed to an application in which entrance and exit of a holder of the RFID card is managed and an application in which a timing of finishing of a competitor is recorded by affixing the RFID inlay to a numbered bib, etc. of the competitor, it becomes possible to perform the transmission and reception of data without being affected by the orientation of the RFID inlay and the positional relationship with the RFID reader.
Description
- The present invention relates to an antenna pattern applied to a UHF frequency band RFID, an RFID inlay, an RFID label, and an RFID medium.
- In the field of manufacture, management, logistics, and so forth of products, tags that are attached to the products and labels that are adhered to the products, etc. are used. Information related to the products are printed on the tags and the labels so as to be visible. In recent years, a technique utilizing an RFID (Radio Frequency Identification), in which identification information written on an IC chip is transmitted and received via a wireless communication, is becoming more and more common in various fields, and the technique is also becoming more familiar in the above-described fields.
- On the tag, the label, an wrist band, and so forth (hereinafter, referred to as an RFID medium) are incorporated an antenna pattern and the IC chip with an RFID specification as described above, information related to a target for attachment, a target for affixation, or an wearer (hereinafter, collectively referred to as an adherend) is printed so as to be visible, and it is possible to store various information related to the adherend in the incorporated IC chip.
- Document
US 2018/039878 A1 describes an RFID tag including an inlay (made of an IC chip and an antenna) and an auxiliary antenna laminated on the inlay in an insulated state. The auxiliary antenna is electrically coupled with the IC chip via capacitive coupling and functions as an antenna to improve/adjust the communication characteristics, in particular the range, of the inlay. - A generally similar arrangement as in
US 2018/039878 A1 is described indocuments EP 2 866 298 A1 andEP 2 866 172 A1 - As an example of an RFID inlay, a UHF frequency band RFID inlay having an IC chip, a loop portion connected with the IC chip, and a dipole antenna connected with the loop portion has been disclosed (see
JP2010-237853A - The RFID inlay described in
JP2010-237853A - Therefore, in a case in which the RFID inlay is applied to, for example, an application in which entrance and exit of a holder of "ID-1" standard card specified in ISO/IEC 7810 is managed by mounting the RFID inlay on the card and an application in which a timing of finishing of a competitor is recorded by affixing the RFID inlay to a numbered bib, etc. of the competitor, there has been a problem in that transmission and reception of information cannot be performed correctly depending on an orientation of the RFID inlay or a positional relationship between the RFID inlay and an RFID reader.
- Thus, an object of the present invention is to increase a direction and range capable of performing transmission and reception by improving directivity of an antenna in a UHF frequency band RFID inlay.
- According to an aspect of the present invention, provided is an antenna pattern for being used in a UHF frequency band RFID inlay, the antenna pattern comprising: a substrate; a dipole antenna formed on a front surface of the substrate with a metal foil; and a sub-element formed on a back surface of the substrate with the metal foil, wherein the dipole antenna is provided with: a loop portion having an IC chip connecting portion to which an IC chip is connected; a pair of meanders configured to respectively extend from the loop portion so as to be line symmetrical by being connected to the loop portion at end portions on one side; and capacitance hats respectively connected to the pair of meanders, and the sub-element has a pair of U-shapes, the sub-element being arranged such that opening sides of the U-shapes face with each other so as to be line symmetrical, the sub-element being formed such that a part thereof overlaps with the dipole antenna through the substrate.
- According to the above-described aspects, it is possible to increase a direction and range capable of performing transmission and reception by improving a directivity of the UHF frequency band RFID antenna.
-
-
FIG. 1A is an external view for explaining a front surface of an RFID inlay according to a first embodiment. -
FIG. 1B is a sectional view taken along a line B-B inFIG. 1A . -
FIG. 2 is an external view for explaining a back surface of the RFID inlay according to the first embodiment. -
FIG. 3 is an external view for explaining a front surface of the RFID inlay according to a second embodiment. -
FIG. 4 is an external view for explaining the back surface of the RFID inlay according to the second embodiment. -
FIG. 5 is an external view for explaining the front surface of the RFID inlay according to a third embodiment. -
FIG. 6 is an external view for explaining the back surface of the RFID inlay according to the third embodiment. -
FIG. 7 is a diagram for explaining a back surface of an RFID label according to the embodiment of the present invention. -
FIG. 8 is a diagram for explaining a front surface of the RFID label according to the embodiment of the present invention. -
FIG. 9 is a diagram for explaining a front surface of an RFID medium according to the embodiment of the present invention. -
FIG. 10 is a diagram for explaining a back surface of the RFID medium according to the embodiment of the present invention. -
FIG. 11 is an external view for explaining the RFID medium as a comparative example used for a directivity test. -
FIG. 12 is a schematic view for explaining a directivity test. -
FIG. 13 is a diagram showing results of the directivity test for specific frequency. - The
RFID inlay 1 and anantenna pattern 10 according to a first embodiment of the present invention will be described. TheRFID inlay 1 in this embodiment is a UHF frequency band RFID inlay. -
FIG. 1A is an external view for explaining a front surface of theRFID inlay 1 according to the first embodiment, andFIG. 1B is a sectional view taken along a line B-B inFIG. 1A . In addition,FIG. 2 is an external view for explaining a back surface of theRFID inlay 1 according to the first embodiment. - In this embodiment, in the
RFID inlay 1, anIC chip 20 with an RFID (Radio Frequency Identification) specification is bonded to theantenna pattern 10 by a vulcanization bonding, etc. using an anisotropic conductive paste or a conductive film. - The
antenna pattern 10 is provided with adipole antenna 31 that is formed on afront surface 11A of asubstrate 11 with a metal foil and asub-element 32 that is formed on aback surface 11B of thesubstrate 11 with the metal foil. As shown inFIG. 1B , thedipole antenna 31 and thesub-element 32 are laminated on thesubstrate 11 with an adhesive agent A. - In
FIG. 1 , thesub-element 32 that is formed on theback surface 11B is illustrated with a dotted line. In addition, inFIG. 2 , thedipole antenna 31 that is formed on thefront surface 11A is illustrated with a dotted line. - In this embodiment, the direction in which the
dipole antenna 31 extends is described as the X direction of theRFID inlay 1, and the direction perpendicular to the X direction is described as the Y direction of theRFID inlay 1. - The
dipole antenna 31 has aloop portion 12 that is formed on thefront surface 11A of thesubstrate 11 with the metal foil and that has an ICchip connecting portion 101 to which theIC chip 20 is connected. Theloop portion 12 is formed on thefront surface 11A of thesubstrate 11 with the metal foil and has the ICchip connecting portion 101 to which theIC chip 20 is connected and apower feeding portion 102 to whichmeander end portions dipole antenna 31 are connected. Theloop portion 12 is formed to have a loop shape that is line symmetrical with respect to a line that passes through the ICchip connecting portion 101 and that is parallel to the Y direction. - In this embodiment, the
loop portion 12 is formed to have a rectangular shape and has a pair of long-side portions loop portion 12 has a pair of short-side portions side portions - In the
loop portion 12, the ICchip connecting portion 101 is formed at the center portion of the long-side portion 121 on one side, and thepower feeding portion 102 is formed towards the center portion side of the long-side portion 122 facing the long-side portion 121 on which the ICchip connecting portion 101 is formed. - In this embodiment, the
dipole antenna 31 is formed in left-right symmetry with respect to theIC chip 20. Thedipole antenna 31 has, on thefront surface 11A,meanders loop portion 12, andcapacitance hats meanders meanders loop portion 12 correspond to themeander end portions - Number of folded portions, curvature radius of curved portions, lengths of the respective portions in the
meanders - Next, the
sub-element 32 will be described with reference toFIG. 2 . InFIG. 2 , the components formed on thefront surface 11A are illustrated with dotted lines. - The
sub-element 32 formed on theback surface 11B has anelement 310 on one side and anelement 320 on the other side, and theelement 310 and theelement 320 each has U-shape and are formed such that their opening sides face each other so as to be in line symmetrical with respect to a line that passes through theIC chip 20 and that is parallel to the Y direction of theRFID inlay 1. - In this embodiment, the
element 310 hasparallel portions dipole antenna 31 extends and aperpendicular portion 315 that joins end portions of theparallel portions element 320 hasparallel portions dipole antenna 31 extends and aperpendicular portion 325 that joins end portions of theparallel portions - Also, the
elements base end portions loop portion 12 through thesubstrate 11. - The
elements base end portions chip connecting portion 101 of theloop portion 12 is positioned so as to overlap the gap formed by thebase end portions substrate 11. - In this embodiment, the widths W1 and W2 of the
parallel portions perpendicular portion 315 in theelement 310, and the widths W4 and W5 of theparallel portions perpendicular portion 325 in theelement 320 are all formed so as to have the same width. - In the
elements - As described below, the
dipole antenna 31 and the sub-element 32 described above are formed on thesubstrate 11. - In the first embodiment, a part of the sub-element 32 is formed so as to overlap with a part of the
dipole antenna 31 through thesubstrate 11 and so as to overlap with a part of the long-side portion 122 on which thepower feeding portion 102 is formed. - More specifically, the
parallel portion 314 in theelement 310 is formed so as to overlap with a part of thedipole antenna 31 on the upper side in the Y direction on the drawings over a region from thecapacitance hat 129 to themeander 127. - In addition, similarly, the
parallel portion 324 in theelement 320 is formed so as to overlap with a part of thedipole antenna 31 on the upper side in the Y direction on the drawings over a region from thecapacitance hat 128 to themeander 126. - In addition, a gap d between the
base end portions chip connecting portion 101 and thepower feeding portion 102 in theloop portion 12 formed on thefront surface 11A through thesubstrate 11. - In this embodiment, as a material applicable as the
substrate 11 includes papers such as fine quality paper, coated paper, and so forth; and a single film made of a resin such as polyvinyl chloride, polyethylene terephthalate, polypropylene, polyethylene, polyethylene naphthalate, and so forth, and a multilayer film formed by laminating a plurality of the resin films. - The thickness of the
substrate 11 is preferably from 25 pm to 300 pm, inclusive. In a case in which the papers are used as the substrate, the thickness can be from 50 pm to 260 pm, inclusive, in the above-described range, and it is generally preferable that the thickness be 80 pm. In addition, in a case in which the resin film is used as the substrate, the thickness can be from 25 pm to 200 pm, inclusive, in the above-described range. From the above, it is possible to make an appropriate selection depending on an application purpose. - In this embodiment, in general, as a metal for forming the metal foil that is used for forming the
loop portion 12 and thedipole antenna 31, an electrically conductive metal used for forming the antenna pattern can be applied. - One example thereof includes copper and aluminum. In view of suppressing the manufacturing cost, it is preferable to use aluminum. In addition, in view of an overall thickness of the
RFID inlay 1, of an overall thickness of the RFID medium when the RFID medium is formed, and of the manufacturing cost, it is preferable that a thickness of the metal foil be from 3 pm to 25 pm, inclusive. More preferably, the metal foil is an aluminum foil having the thickness of 20 pm. - In this embodiment, the metal foil is adhered to the
substrate 11 with the adhesive agent A. - In addition, in this embodiment, the
dipole antenna 31 in theantenna pattern 10 is designed as a pattern adapted to a UHF frequency band (300 MHz to 3GHz, especially, 860 MHz to 960 MHz). - With a conventional dipole antenna, the gain is poor in the longitudinal direction of the antenna (the X direction when associated with
FIG. 1 ), and transmission and reception sensitivity in this direction is lowered. - In contrast, the
RFID inlay 1 according to the first embodiment is provided with the sub-element 32. The sub-element 32 is formed so as to overlap with a part of thedipole antenna 31 through thesubstrate 11 and so as to overlap with a part of the long-side portion 122 in which thepower feeding portion 102 is formed. With such a configuration, it is possible to increase the gain in the X direction inFIGs. 1 and2 and to increase the transmission and reception sensitivity in the X direction. - As described above, the sub-element 32 has a function of compensating the gain of the
dipole antenna 31 such that theRFID inlay 1 functions as an omnidirectional antenna. - In addition, the
elements elements - An
RFID inlay 2 and anantenna pattern 40 according to a second embodiment of the present invention will be described. In the second embodiment, a positional relationship between thedipole antenna 31 and a sub-element 33 is modified. In other words, the length H of the sub-element 33 in the Y direction is longer than that of the sub-element 32. In addition, the gap d between base end portions 332 and 342 is reduced. -
FIG. 3 is an external view for explaining a front surface of theRFID inlay 2 according to the second embodiment. In addition,FIG. 4 is an external view for explaining a back surface of theRFID inlay 2 according to the second embodiment. Configurations that have the same functions as the configurations shown in the first embodiment are assigned the same reference signs, and detailed descriptions thereof shall be omitted. - In the
RFID inlay 2 that is shown as the second embodiment, theantenna pattern 40 has thesubstrate 11, theloop portion 12 that is formed on thefront surface 11A of thesubstrate 11 with the metal foil, thedipole antenna 31 that is formed on thefront surface 11A of thesubstrate 11 with the metal foil, and the sub-element 33 that is formed on theback surface 11B. - As shown in
FIG. 4 , the sub-element 33 that is formed on theback surface 11B has a left-right symmetric U-shapes on theback surface 11B and has anelement 330 on one side and anelement 340 on the other side. - The
element 330 hasparallel portions dipole antenna 31 extends and aperpendicular portion 335 that joins end portions of theparallel portions element 340 hasparallel portions dipole antenna 31 extends and aperpendicular portion 345 that joins end portions of theparallel portions - The
elements - In the
elements base end portions antenna pattern 10 that is shown as the first embodiment, and theIC chip 20 is formed so as to be positioned in the gap formed between the base end portions 332 and 342 through thesubstrate 11. - Similarly to the first embodiment, all of the widths of the
elements - In the second embodiment, a part of the sub-element 33 is formed at the position where it overlaps with a part of the
dipole antenna 31 through thesubstrate 11, and a part of the sub-element 33 is formed at the position where it intersects with the short-side portions loop portion 12 through thesubstrate 11. - In addition, in the second embodiment, a part of the sub-element 33 is formed at the position where it does not overlap with, through the
substrate 11, the long-side portion 121 formed with the ICchip connecting portion 101 and the long-side portion 122 formed with thepower feeding portion 102. - In the
RFID inlay 2 according to the second embodiment, a part of the sub-element 33 overlaps with a part of thedipole antenna 31 through thesubstrate 11, a part of the sub-element 33 intersects with the short-side portions side portion 121 formed with the IC chip connecting portion 101and the long-side portion 122 formed with thepower feeding portion 102. - With such a configuration, it is possible to increase the gain in the X direction in
FIGs. 3 and4 , and to further increase the transmission and reception sensitivity in the X direction. - An
RFID inlay 3 and anantenna pattern 50 according to a third embodiment of the present invention will be described. In the third embodiment, a sub-element 34 formed in theantenna pattern 50 is formed to have a shape in which baseend portions elements elements -
FIG. 5 is an external view for explaining a front surface of theRFID inlay 3 according to the third embodiment. In addition,FIG. 6 is an external view for explaining a back surface of theRFID inlay 3 according to the third embodiment. Configurations that have the same functions as the configurations shown in the first embodiment are assigned the same reference signs, and detailed descriptions thereof shall be omitted. - In the
RFID inlay 3 shown as the third embodiment, theantenna pattern 50 has thesubstrate 11, theloop portion 12 formed on thefront surface 11A of thesubstrate 11 with the metal foil, thedipole antenna 31 formed on thefront surface 11A of thesubstrate 11 with the metal foil, and the sub-element 34 formed on theback surface 11B. - As shown in
FIG. 6 , the sub-element 34 formed on theback surface 11B has a symmetrical shape on theback surface 11B and has theelement 350 on one side and theelement 360 on the other side. - The
element 350 hasparallel portions dipole antenna 31 extends and aperpendicular portion 355 that joins end portions of theparallel portions element 350, an end portion of theparallel portion 354 forms abent portion 356 by being bent outwards of thesubstrate 11. - In addition, the
element 360 hasparallel portions dipole antenna 31 extends and aperpendicular portion 365 that joins end portions of theparallel portions element 360, an end portion of theparallel portion 364 forms abent portion 366 by being bent outwards of thesubstrate 11. - The
elements substrate 11. - Similarly to the first embodiment, all of the widths of the
elements - In the third embodiment, a part of the sub-element 34 is formed at the position where it overlaps with a part of the
dipole antenna 31 through thesubstrate 11 and at the position where it overlaps with a part of the long-side portion 122 formed with thepower feeding portion 102. - In other words, the
parallel portion 354 in theelement 350 is formed so as to overlap with a part of thedipole antenna 31 on the upper side in the Y direction on the drawings over a region from thecapacitance hat 129 to themeander 127. - In addition, the
parallel portion 364 in theelement 360 is formed so as to overlap with a part of thedipole antenna 31 on the upper side in the Y direction on the drawings over a region from thecapacitance hat 128 to themeander 126. - In addition, the
bent portions side portions substrate 11. - With the
RFID inlay 3 according to the third embodiment, theparallel portion 354 in theelement 350 is formed so as to overlap with a part of thedipole antenna 31 on the upper side in the Y direction on the drawings through the substrate over a region from thecapacitance hat 129 to themeander 127, theparallel portion 364 in theelement 360 are formed so as to overlap with a part of thedipole antenna 31 on the upper side in the Y direction on the drawings through thesubstrate 11 over a region from thecapacitance hat 128 to themeander 126, and thebent portions side portions substrate 11. - With such a configuration, the gain in the X direction of the
RFID inlay 3 inFIGs. 5 and6 is increased, and thereby, it is possible to increase the transmission and reception sensitivity in the X direction. - Next, an
RFID label 5 according to the embodiment of the present invention will be described. TheRFID label 5 is formed by temporarily adhering a separator on a first surface (or a second surface) of theRFID inlay 1, which has been described as the first embodiment, with the adhesive agent and by laminating an outer substrate on the second surface. -
FIG. 7 is a diagram for explaining a back surface of theRFID label 5 according to the embodiment of the present invention. In addition,FIG. 8 is a diagram for explaining a front surface of theRFID label 5 according to the embodiment of the present invention. - As shown in
FIGs. 7 and8 , theRFID label 5 has: aseparator 60 that is temporarily adhered on thefront surface 11A of thesubstrate 11 of theRFID inlay 1, which has been described as the first embodiment, with an adhesive agent B; and anouter substrate 70 that is laminated, with a bonding agent C, on theback surface 11B on the reverse side of the surface on which theseparator 60 has been temporarily adhered. Here, theouter substrate 70 serves as an information recording substrate that is a substrate having a surface suitable for printing. Theouter substrate 70 may be a thermal paper. - Here, in general, as the adhesive agent B, it is possible to use an adhesive agent that can be used with the separator and a bonding agent that can be used for lamination of the substrate. In addition, in general, as the bonding agent C, it is possible to use those that can be used to laminate the substrates.
- As an example of the bonding agent C, it may be possible to use emulsion bonding agents, solvent bonding agents, and hot melt bonding agents. As the adhesive, it is possible to apply acrylic bonding agents, urethane bonding agents, silicone bonding agents, rubber bonding agents, and so forth.
- In addition, it may also be possible to use the adhesive agent instead of the bonding agent C. The adhesive agent that can be used in this case includes the adhesive agent such as acrylic adhesives, urethane adhesives, silicone adhesives, rubber adhesives, and so forth.
- With the
RFID label 5 having such a configuration, information can be printed on theouter substrate 70 having a printing surface by using a label printer, and theRFID label 5 can be used by being adhered to a product, etc. by removing theseparator 60. - Because the
integrated RFID inlay 1 has the sub-element 32 and antenna characteristics corresponding to those of the omnidirectional antenna can be achieved, even if theRFID label 5 according to this embodiment is used by being adhered to the product, etc., it is possible to perform the transmission and reception of data without being affected by positional relationship with a reader/writer. - In
FIGs. 7 and8 , although a description has been given of a case in which theRFID inlay 1 according to the first embodiment employing theantenna pattern 10 is applied, theRFID inlay 2 that employs theantenna pattern 40 and theRFID inlay 3 that employs theantenna pattern 50 may also be applied. - In the example shown in
FIGs. 7 and8 , for an application purpose in which the RFID label is adhered to a part that is not exposed to the outside, such as a case in which the attachment target is an interior of an apparatus, theouter substrate 70 may not necessarily be required. - Next, an
RFID medium 6 according to the embodiment of the present invention will be described. TheRFID medium 6 is formed by laminating the outer substrates on both surfaces of theRFID inlay 1, which has been described as the first embodiment, with the adhesive agent. -
FIG. 9 is a diagram for explaining a front surface of theRFID medium 6 according to the embodiment of the present invention. In addition,FIG. 10 is a diagram for explaining a back surface of theRFID medium 6 according to the embodiment of the present invention. - As shown in
FIGs. 9 and10 , theRFID medium 6 has anouter substrate 80 that is laminated on thefront surface 11A of thesubstrate 11 of theRFID inlay 1, which has been described as the first embodiment, with the bonding agent C and anouter substrate 90 that is laminated on theback surface 11B with the bonding agent C. In the above, theouter substrates outer substrates - An example of the
RFID medium 6 having such a configuration includes an RFID tag. The RFID tag can be used by attaching it to apparel product, etc. by using a thread or a tag pin. - Because the
integrated RFID inlay 1 has the sub-element 32 and antenna characteristics corresponding to those of the omnidirectional antenna can be achieved, even if theRFID medium 6 according to this embodiment is used by being attached to the apparel product, etc., it is possible to perform the transmission and reception of data without being affected by positional relationship with a reader/writer. - In
FIGs. 9 and10 , although a description has been given of a case in which theRFID inlay 1 according to the first embodiment employing theantenna pattern 10 is applied, theRFID inlay 2 that employs theantenna pattern 40 and theRFID inlay 3 that employs theantenna pattern 50 may also be applied. - An evaluation for the directivity is performed on the above-described
RFID inlay -
FIG. 12 is a schematic view for explaining the directivity test. A UHF frequency band RFID reader/writer (R/W) was arranged such that its antenna center is located on a position T on a circle having radius of 1.5 meter and having its center at a position P of the IC chip in the RFID tag as a test specimen S, and wave gain from the RFID tag was measured while moving the RFID reader/writer along the circle. - The position of the reader/writer the above-described circle is expressed in terms of angle relative to the starting position where the angle is set as 0°, and relationships between the angle and wave gain are shown on a chart.
- The RFID tag of Example 1 is manufactured on the basis of the
RFID medium 6 according to this embodiment described above. - A basic configuration is as following: the
dipole antenna 31 shown inFIG. 1 was formed with an aluminum foil having the thickness of 20 pm on the front surface of a substrate made of a PET film having the thickness of 50 pm, and on the back surface thereof, the sub-element 32 shown inFIG. 2 was formed with the aluminum foil having the thickness of 20 pm, thereby forming theantenna pattern 10. An IC (Monza R6 from Impinj, Inc.) was mounted on thus formeddipole antenna 31 to manufacture theRFID inlay 1 according to the first embodiment. In the above, the configuration on thedipole antenna 31 side had the same configuration as that of Product Number: ST7015 R6-RE01 from SATO HOLDINGS CORPORATION. - The
outer substrates RFID inlay 1 obtained as described above by using the bonding agent C, and thereby, the RFID tag that was used as the test specimen was obtained. - The RFID tag used as the test specimen was obtained similarly to Example 1 except that the sub-element 33 shown in
FIG. 4 was used instead of the sub-element 32. - The RFID tag used as the test specimen was obtained similarly to Example 1 except that the sub-element 34 shown in
FIG. 6 was used instead of the sub-element 32. - As a comparative example, an RFID tag R in which the sub-element was not provided in the RFID tag of Example 1 was prepared.
FIG. 11 is an external view for explaining the RFID tag as the comparative example used for the directivity test. The RFID tag R as the comparative example is formed by laminating theouter substrates -
FIG. 13 is a diagram showing results for the directivity test for the measurement frequency. As shown inFIG. 13 , with the RFID tag of the comparative example that is not provided with the sub-element, the gain is weak in the direction in which the dipole antenna extends (the X direction when associated withFIG. 1 ). In contrast, with the RFID tags of Examples 1, 2, and 3 that are respectively provided with the sub-element 32, 33, and 34, the gain in the X direction is increased. - As described above, it was found out that, by providing the sub-element on the RFID inlay, it is possible to increase the gain in the extending direction of the dipole antenna 31 (the X direction) that is formed so as to be connected to the
loop portion 12 and to extend in the X direction. - Although the embodiments of the present invention have been described in the above, the above-mentioned embodiments merely illustrate a part of application examples of the present invention, and the technical scope of the present invention is not intended to be limited to the specific configurations of the above-described embodiments.
- In the first embodiment, a description has been given of a case in which the
dipole antenna 31 is formed on thefront surface 11A and the sub-element 32 is formed on theback surface 11B. However, thefront surface 11A and theback surface 11B are named for the sake of ease of explaining, and a configuration in which, inFIGs. 1 and2 , the sub-element 32 is formed on thefront surface 11A and thedipole antenna 31 is formed on theback surface 11B has equivalent advantages. The same applies to the sub-elements 33 and 34 in the second embodiment and the third embodiment. - In this embodiment, in addition to those shown in the drawings, "the U-shape" includes a shape in which the portion corresponding to the bottom portion of the U-shape has an arc-shape, and a shape in which the portion corresponding to the bottom portion of the U-shape is a straight line and in which both ends of the straight line continues to parallel portions of the U-shape by being curved.
- The number or turns, turning shape, and so forth of the
meanders dipole antenna 31 shown in the embodiments can be modified appropriately, and the present invention is not limited to those illustrated. - For the
RFID label 5 shown inFIGs. 7 and8 , and theRFID medium 6 shown inFIGs. 9 and10 , although a description has been given of a case in which theRFID inlay 1 according to the first embodiment employing theantenna pattern 10 is applied, theRFID inlay 2 that employs theantenna pattern 40 and theRFID inlay 3 that employs theantenna pattern 50 may also be applied. - In addition, for example, the present invention is also applicable to an RFID card in which the RFID inlay is mounted on "ID-1" standard card specified in ISO/IEC 7810. In a case in which the RFID inlay is employed to an application in which entrance and exit of a holder of the RFID card is managed and an application in which a timing of finishing of a competitor is recorded by affixing the RFID inlay to a numbered bib, etc. of the competitor, it becomes possible to perform the transmission and reception of data without being affected by the orientation of the RFID inlay and the positional relationship with the RFID reader.
Claims (10)
- An antenna pattern (10) for being used in a UHF frequency band RFID inlay, comprising:a substrate (11);a dipole antenna (31) formed on a front surface (11A) of the substrate with a metal foil; anda sub-element (32) formed on a back surface (11B) of the substrate with the metal foil, whereinthe dipole antenna (31) is provided with:a loop portion (12) having an IC chip connecting portion (101) to which an IC chip (20) is connected;a pair of meanders (126, 127) configured to respectively extend from the loop portion (12) so as to be line symmetrical by being connected to the loop portion (12) at end portions (111, 112) on one side; andcapacitance hats (128, 129) respectively connected to the pair of meanders (126, 127), wherein,the sub-element (32) being formed such that a part thereof overlaps with the dipole antenna (31) through the substrate (11),characterized in thatthe sub-element (32) has a pair of U-shapes, the sub-element being arranged such that opening sides of the U-shapes face with each other so as to be line symmetrical.
- The antenna pattern (10) according to claim 1, wherein respective base end portions (312, 322) in the pair of U-shapes of the sub-element (32) are formed so as to overlap with a part of the loop portion (12) through the substrate (11).
- The antenna pattern (10) according to claim 1, wherein the IC chip connecting portion (101) of the loop portion (12) is positioned, through the substrate (11), in one of: a gap between respective base end portions (312, 322) of the pair of U-shapes of the sub-element (32), the gap being formed by the base end portions (312, 322) facing with each other; and a gap between respective tip end portions (311, 321) of the pair of U-shapes of the sub-element (32), the gap being formed by the tip end portions (311, 321) facing with each other.
- The antenna pattern (10) according to claim 1, whereinthe loop portion (12) has a rectangular shape having a pair of facing long-side portions (121, 122) and a pair of short-side portions (124, 125) configured to connect end portions of the long-side portions (121, 122) with each other,the IC chip connecting portion (101) is formed on one of the long-side portions (121), and the meander (126, 127) is connected to the long-side portion (122) facing the long-side portion (121) on which the IC chip connecting portion (101) is formed, anda part of the sub-element (32) overlaps with a part of the dipole antenna (31) through the substrate (11) and overlaps with a part of the long-side portion (122) to which the meander (126, 127) is connected.
- The antenna pattern (10) according to claim 1, whereinthe loop portion (12) has a rectangular shape having a pair of facing long-side portions (121, 122) and a pair of short-side portions (124, 125) configured to connect end portions of the long-side portions (1221, 122),the IC chip connecting portion (101) is formed on one of the long-side portions (121), and the meander (126, 127) is connected to the long-side portion (122) facing the long-side portion (121) on which the IC chip connecting portion (101) is formed, anda part of the sub-element (32) overlaps with a part of the dipole antenna (31) through the substrate (11) and intersects with the short-side portion (124, 125), but does not overlap with the long-side portion (122) to which the IC chip connecting portion (101) is formed and the long-side portion (122) to which the meander (126, 127) is connected.
- The antenna pattern (10) according to claim 1, whereinthe loop portion (12) has a rectangular shape having a pair of facing long-side portions (121, 122) and a pair of short-side portions (124, 125) configured to connect end portions of the long-side portions (121, 122),the IC chip connecting portion (101) is formed on one of the long-side portions (121), and the meander (126, 127) is connected to the long-side portion (122) facing the long-side portion (121) on which the IC chip connecting portion (101) is formed, anda part of the sub-element (32) overlaps with a part of the dipole antenna (31) through the substrate (11), covers an entire region of the short-side portion (124, 125), and overlaps with a part of the long-side portion (121) to which the IC chip connecting portion (101) is formed and a part of the long-side portion (122) to which the meander (126, 127) is connected.
- A UHF frequency band RFID inlay (1) comprising:the antenna pattern (10) according to any one of claims 1 to 6 andthe IC chip (20) connected to the IC chip connecting portion (101) in the antenna pattern (10).
- An RFID label (5) comprising the UHF frequency band RFID inlay according to claim 7 wherein a separator (60) is temporarily adhered on one of surfaces of the UHF frequency band RFID inlay (1) with an adhesive agent (C).
- An RFID label (5) comprising the UHF frequency band RFID inlay according to claim 7 wherein a separator (60) is temporarily adhered on one of surfaces of the UHF frequency band RFID inlay (1) with an adhesive agent (C) and an information recording substrate (70) is laminated on a surface on a reverse side of the surface on which the separator (60) is temporarily adhered.
- An RFID medium (6) comprising the UHF frequency band RFID inlay according to claim 7 wherein both surfaces of the UHF frequency band RFID inlay (1) are sandwiched by a plurality of outer substrates (80, 90) with a bonding agent.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2018029074A JP6941069B2 (en) | 2018-02-21 | 2018-02-21 | Antenna patterns, RFID inlays, RFID labels and RFID media |
PCT/JP2019/003509 WO2019163473A1 (en) | 2018-02-21 | 2019-01-31 | Antenna pattern, rfid inlay, rfid label, and rfid medium |
Publications (3)
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EP3757893A1 EP3757893A1 (en) | 2020-12-30 |
EP3757893A4 EP3757893A4 (en) | 2021-05-05 |
EP3757893B1 true EP3757893B1 (en) | 2023-08-23 |
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EP19757232.4A Active EP3757893B1 (en) | 2018-02-21 | 2019-01-31 | Antenna pattern, rfid inlay, rfid label, and rfid medium |
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US (1) | US11227205B2 (en) |
EP (1) | EP3757893B1 (en) |
JP (1) | JP6941069B2 (en) |
CN (1) | CN111566672B (en) |
WO (1) | WO2019163473A1 (en) |
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JP6941068B2 (en) * | 2018-02-21 | 2021-09-29 | サトーホールディングス株式会社 | Antenna pattern manufacturing method, RFID inlay manufacturing method, RFID label manufacturing method and RFID medium manufacturing method |
EP3828220A4 (en) | 2019-08-08 | 2022-08-03 | Sumitomo Bakelite Co.Ltd. | Sealing resin composition and electronic part |
CN113285206B (en) * | 2021-05-26 | 2022-06-07 | 湖南工程学院 | Miniaturized omnidirectional UHF-RFID (ultra high frequency-radio frequency identification) tag antenna and preparation method thereof |
USD1003876S1 (en) * | 2022-01-27 | 2023-11-07 | Avery Dennison Retail Information Services Llc | Antenna |
USD1001785S1 (en) * | 2022-01-27 | 2023-10-17 | Avery Dennison Retail Information Services Llc | Antenna |
USD1007485S1 (en) * | 2022-02-16 | 2023-12-12 | Avery Dennison Retail Information Services Llc | Antenna |
USD1003283S1 (en) * | 2022-02-16 | 2023-10-31 | Avery Dennison Retail Information Services Llc | Antenna |
USD1002598S1 (en) * | 2022-02-17 | 2023-10-24 | Avery Dennison Retail Information Services Llc | Antenna |
USD1004578S1 (en) * | 2022-03-24 | 2023-11-14 | Avery Dennison Retail Information Services Llc | Antenna |
WO2023235617A1 (en) * | 2022-06-03 | 2023-12-07 | Checkpoint Systems, Inc. | Rfid antenna for rejecting unwanted rf signals |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2866298B1 (en) * | 2012-06-26 | 2020-05-06 | Toyo Seikan Group Holdings, Ltd. | Rf tag |
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JP5208830B2 (en) | 2009-03-30 | 2013-06-12 | 株式会社サトー知識財産研究所 | RFID label roll and method of manufacturing RFID label roll |
JP2011182392A (en) * | 2010-02-08 | 2011-09-15 | Sinfonia Technology Co Ltd | Dipole-type ic tag antenna, antenna roll and method of using ic tag |
WO2013124916A1 (en) | 2012-02-21 | 2013-08-29 | パナソニック株式会社 | Organic light-emitting device and method for producing same |
JP5953978B2 (en) * | 2012-06-26 | 2016-07-20 | 東洋製罐株式会社 | RF tag |
CN104428797B (en) * | 2012-06-26 | 2017-03-29 | 东洋制罐集团控股株式会社 | RF labels |
JP5910883B2 (en) * | 2012-09-11 | 2016-04-27 | 株式会社 ワイテックス | Composite antenna for wireless tag |
EP3288114B1 (en) * | 2015-04-21 | 2022-01-05 | Toyo Seikan Group Holdings, Ltd. | Rf tag |
WO2017159222A1 (en) * | 2016-03-18 | 2017-09-21 | サトーホールディングス株式会社 | Method for manufacturing antenna pattern, method for manufacturing rfid inlet, method for manufacturing rfid label, and method for manufacturing rfid medium |
-
2018
- 2018-02-21 JP JP2018029074A patent/JP6941069B2/en active Active
-
2019
- 2019-01-31 US US16/961,023 patent/US11227205B2/en active Active
- 2019-01-31 EP EP19757232.4A patent/EP3757893B1/en active Active
- 2019-01-31 WO PCT/JP2019/003509 patent/WO2019163473A1/en unknown
- 2019-01-31 CN CN201980007823.8A patent/CN111566672B/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2866298B1 (en) * | 2012-06-26 | 2020-05-06 | Toyo Seikan Group Holdings, Ltd. | Rf tag |
Also Published As
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CN111566672B (en) | 2023-08-15 |
JP2019146043A (en) | 2019-08-29 |
EP3757893A1 (en) | 2020-12-30 |
EP3757893A4 (en) | 2021-05-05 |
US11227205B2 (en) | 2022-01-18 |
CN111566672A (en) | 2020-08-21 |
WO2019163473A1 (en) | 2019-08-29 |
JP6941069B2 (en) | 2021-09-29 |
US20200373674A1 (en) | 2020-11-26 |
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